Eu hesito em dizer "não", mas parece incrivelmente improvável. De Retorno do Rei (ênfase minha):
The Captains mounted again and rode back, and from the host of Mordor there went up a jeering yell. Dust rose smothering the air, as from nearby there marched up an army of Easterlings that had waited for the signal in the shadows of Ered Lithui beyond the further Tower. Down from the hills on either side of the Morannon poured Orcs innumerable. The men of the West were trapped, and soon. All about the grey mounds where they stood, forces ten times and more than ten times their match would ring them in a sea of enemies. Sauron had taken the proffered bait in jaws of steel.
Return of the King Book V Chapter 10: "The Black Gate Opens"
E (ênfase minha):
All about the hills the hosts of Mordor raged. The Captains of the West were foundering in a gathering sea. The sun gleamed red, and under the wings of the Nazgûl the shadows of death fell dark upon the earth.
Return of the King Book VI Chapter 4: "The Field of Cormallen"
A probabilidade de qualquer exército derrotar uma força mais do que dez vezes o seu tamanho é, embora não seja zero, extremamente baixa.